Abstract: The remote collaborative identification system is based on H.323 protocol. It is a real-time interactive system can be applied to various fields. By providing mixed audio, switching video, written communication technologies and so on, what’s more, transport high-definition image under low bandwidth conditions between remote experts and the work staff, this system can conveniently and efficiently identify the unknown samples, increase the accuracy and authority of the identification work. At the same time, this paper gives a subtle solution for the very knotty problem:NAT and the firewall penetration, exists in H.323 conference system and IP telephone in practical usage. And the solution does not need to change the existing firewall system.